论述了优树选择应遵循优良种源区选择优良林分，优良林分中选择优良单株的系统选择原则。
The selection principle is selecting stand from fine seed source and from them selecting fine individuality.
论述了优树选择应遵循优良种源区选择优良林分，优良林分中选择优良单株的系统选择原则。
The selection principle is selecting stand from fine seed source and from them selecting fine individuality.
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